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Finding the Fourth Proportional to 274.14, 378.20 and 163.55

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Solution

The fourth proportional to 274.14, 378.20 and 163.55 is: 225.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.14 : 378.20 = 163.55 : x
  2. Step 2: Convert to fraction form
    274.14/378.20 = 163.55/x
  3. Step 3: Cross multiply
    274.14x = 378.20 × 163.55
  4. Step 4: Simplify right side
    274.14x = 61,855.96
  5. Step 5: Solve for x
    x = 61,855.96/274.14
  6. Step 6: Final answer
    x = 225.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.